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| HAL : hal-00647372, version 1 |
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| IEEE International Symposium on Information Theory (ISIT 2011), Saint-Petersbourg : Russie, Fédération De (2011) |
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| On Imperfect CSI for the Downlink of a Two-Tier Network |
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| Salam Akoum 1, 2Marios Kountouris 3 |
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| (31/07/2011) |
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| In this paper, we consider a hierarchical two-tier cellular network where a macrocell is overlaid with a tier of randomly distributed femtocells. We evaluate the combined effect of uncoordinated cross-tier interference, feedback delay, and quantization errors on the achievable rate of transmit beamforming with imperfect channel state information (CSI). We model the femtocell spatial distribution as a Poisson point process (PPP) and the temporal correlation of the channel according to a Gauss-Markov model. Using stochastic geometry tools, we derive the probability of outage at the macrocell users as a function of the temporal correlation, the femtocell density, and the feedback rate. We compute the maximum average achievable rate on the downlink of the macrocell network using a properly designed rate backoff scheme. We show that transmit beamforming with imperfect CSI is a viable option for the downlink of a two-tier cellular network, and that rate backoff recovers the loss in rate due to packet outage. |
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| 1 : | Chaire Radio Flexible Alcatel-Lucent/Supélec (Chaire Radio Flexible) |
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SUPELEC – ALCATEL-LUCENT |
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| 2 : | Department of Electrical and Computer Engineering - University of Texas (ECE) |
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University of Texas at Austin |
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| 3 : | Supélec Sciences des Systèmes - EA4454 (E3S) |
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SUPELEC |
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| TEL - Département Télécommunications |
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| Domaine | : | Informatique/Théorie de l'information et codage Mathématiques/Théorie de l'information et codage |
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| Liste des fichiers attachés à ce document : | |||||
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| hal-00647372, version 1 | |
| http://hal-supelec.archives-ouvertes.fr/hal-00647372 | |
| oai:hal-supelec.archives-ouvertes.fr:hal-00647372 | |
| Contributeur : Samir Medina Perlaza | |
| Soumis le : Jeudi 1 Décembre 2011, 21:48:13 | |
| Dernière modification le : Vendredi 2 Décembre 2011, 09:09:57 | |
